Hello Arduino people!
I'm working on a project where i'm making a sequencer for an old analog drum machine. I got this cute little box called the Yamaha MR10. It's full analog, doesn't sound nearly as good as all the TR machines, but it fun, cheap, and the bass drum is quite good.
Anyway, It only has pre-programmed rhythms, so you can only play cheesy songs.
But! it does have a few pads on the front to trigger some of the samples.
And, looking at the schematic, it shouldn't be too hard to add extra triggers and add some pots for sound control.
I got quite far at building a sequencer (only started using arduino's and programming them really about a week ago) but i'm having some trouble with the triggering.
The way I've got it set up now, is that a pin of the arduino goes hi for about 18ms (i think that's the standard trigger time, doesn't really matter if I change it) and it closes a gate on a 4066 IC
It does work, since the pads are basically on/off buttons themselves, but i do get some distortion.
I notice the sound triggers softer if played with the 4066 IC, and I think (not an expert) it's because the 4066 grounds the outputs when the trigger closes. I notice that the moment I connect the leads to the 4066, the sound triggers once, and after that, it plays softer.
It could also be because the MR10 works on -9 volts..
there's a big schematic here
If I extend the pads with normal push buttons, I get the normal sound..
So basically, what i was wondering, is there another way to trigger the envelopes of this drum machine? or a way to create my own -9v trigger pulses?
Thanks for reading